Title: Help Request: CGminer / 5850 Litecoining Overclocking Quirk Post by: planman on February 22, 2013, 08:47:31 AM Hello Everyone,
The hash rate on one of 5850s has suddenly dropped after running drama free for an extended time. I run 1 x 5830, 2 x5850's, and one 6870 in a single rig. I Run CGMINER 2.10.5, Windows 7, and the latest drivers from AMD. I mine litecloins. The Khash rate has been unchanged for 30 days since I setup the rig. I take notes and pictures to document my numbers. For the last month my hash rates were 5830 -- 299-301 Khash 73C 5850 -- 381-384 Khash 72C 5850 -- 381-384 Khash 72C 6870 -- 297-299 Khash 73C Windows and all other auto-updates are turned off so far as I know. Suddenly this morning the hash rate dropped. Here's is what I found: 5830 -- 299-301 Khash 73C 5850 -- 299-301 Khash 72C <====Changed from 381-384 5850 -- 381-384 Khash 72C 6870 -- 297-299 Khash 73C I literally had not touched the machine... First I hit Q and shutdown, power off, reboot, and relaunch. Still stuck at 300Khash Second I check my command line (below) and my command line is unchanged: cgminer --scrypt -o http://ltc.pool.ext:port -u user -password x --auto-fan -I 19 -g 1 -w 256,256,256,256 --lookup-gap 2,2,2,2 --temp-target 75,75,75,75 --temp-overheat 85,85,85,85 --thread-concurrency 8192,8000,8000,8000 --gpu-engine 950,915,915,915 --gpu-memclock 900,1100,1100,1200 --failover-only (I have run this command line unchanged for weeks, open to tuning suggestions but mainly trying to understand the drop in hash rate first) Third I restarted CGminer, the used <G> <C> 2 to check the GPU speed of GPU 1 (the slow 5850). The GPU speed is 725! I set the GPU speed to 915 but no increase in hash AND when I recheck the card in cgminer we are still at GPU speed of 725 and memory of 1000. I exited CGminer and ran Sapphire Tweak. Tweak show the GPU at 915! So I restart CGMINER and recheck the card. GPU is back down to 725/1000. Exit, check Sappire abd Sapphire Tweak says 915/1100! Restart CGminer and back to 725/1000 I delete all the ,bin files in the cgminer software folder and restart using the above command line.... and the 585- is back to 725/1000. Poweroffs, reboots, even minor tweaking of the command libe have failed. Does anyone have any suggestions? What did I miss? Thank you, Charles Title: Re: Help Request: CGminer / 5850 Litecoining Overclocking Quirk Post by: planman on February 22, 2013, 09:29:05 AM Drum roll please!
Self-solving mystery case come to a conclusion: If the software did not change, it must be the hardware. I pulled the card out of the riser cable, re-seated it, and we are hashing along at 388 on both 5850's now... Wow, that was 5 hours well spent! ;D |